Gold(I) forms neutral complexes with binol phosphates that are unreactive in the catalytic cyclisation of enynes. Reaction in protic solvents or activation by silver(I) restores the catalytic activity.
![Phosphate ligands in the gold(I)-catalysed activation of enynes](https://www.iciq.org/wp-content/uploads/2014/03/Phosphate-ligands-in-the-gold_52.gif)
Gold(I) forms neutral complexes with binol phosphates that are unreactive in the catalytic cyclisation of enynes. Reaction in protic solvents or activation by silver(I) restores the catalytic activity.